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数学 高校生

数Ⅰ*2次関数 (2)です なぜx=1のとき最大値は-m+7になるのですか? 教えていただきたいです.ˬ.)"

DISNEY 68 第2章 2 Step Up (p.107) 7 (1) αを負の定数とする. 2次関数f(x)=ax²-2ax+b の-2≦x≦2における最大値 0010 (2) 関数y=x2+4x-m+2(-2≦x≦1) の最大値と最小値の和が0のとき,定数の が12, 最小値が−6のとき, α, 値とそのときの最大値、最小値を求めよ. <考え方> (1) グラフは上に凸 (1) y=f(x)=ax²-2ax+b とおく.! y=a(x2-2x)+3 軸は直線 x=1 より, 区間 -2≦x≦2 内にあるので,軸のところで最大値をと り,軸から遠い方の区間の端で最小値をとる.0)=(-x) (1-x) (2) グラフは下に凸 =α{(x-1)²-1}+b =a(x-1)2-a+6 *a<0 より -2≦x≦2 のとき, グラフは右の図 のようになる. したがって, グラフより, x=1のとき最大値をとるから、 軸は直線 x=-2 より,区間 -2≦x≦1の端にあるので,軸のところで最小値 をとり、軸とは反対側の端で最大値をとる. - a+b=12 x=-2のとき最小値をとるから, 8a+b=-6....... ② よって, ①,②を解いて, (2) y=x²+4x-m+2 ×になる. = (x+2)²-m-2343870 より, グラフは右の図のよう グラフより, x=1のとき? ..... よって, このとき 最大値 +7 x=-2のとき, 最小値-m-2 AS M をとる. 最大値と最小値の和が0だから, (-m+7)+(-m-2)=0 m= bの値を求めよ. 9 2 BAY RAJSTOASA 2 12 -2 a=-2,b=10 最小 0 12 9 最大値 12/27(x=1のとき) 最小値 最小 最大9 1 2. ! YA I -6 x=-2のとき) 73024 O 1 1 x 3> x=98 x 08431 SAVO 3624 8:8-09 : 90 FH-HES THE BAT 軸から遠い点ほど yの値が小さい。 α<0 を満たしている. 1983 098 RAIDASTOPAD * 01 2>*>0 ので、絶によ 201

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英語 中学生

(2)(3)教えてください🙇‍♀️

A history teacher was talking to his class about the ancient Romans. USOSAUKS "They were very strong, brave people, and they were good soldiers," he said. "They always wanted to have strong bodies, so they played a lot of games." 101 3 * exem "Did they like swimming?" one of the girls asked." That makes people’s bodies 5 strong." She was very good at swimming. - of worl ed es “Oh, yes, some of them swam a lot," the teacher answered. a story /famous / told / Roman/he/about). d(>898 "There was a big, wide river in the middle of Rome," he said. this man swam across it three times every day before breakfast." es every day she heard this. OR Then ( them / one / 2 → [yd]is boeiique od “It was the Tiber, and The girl laughed when “Why are you laughing?" the teacher asked her angrily. "Have I said anything funny?" "Well, sir," the girl answered, "Why didn't he swim across the river four times, to get back to his clothes again?" □(1) 下線部①の英文を, That の内容が具体的にわかるように日本文にしなさい。 genobyed (S)D ves/was/with/green ).) (2) 下線部②の()内の語(句) を並べかえて, 正しい英文にしなさい。ig seart stimuy bia (e Then □(3) 次の本文の内容についての質問に答えるとき,空所に適語を書きなさい。 aoy bib S 1. Why did the ancient Romans play a lot of games? (be/clean/has/kept/to). to have strong Because they 2. How many times did the famous Roman swim across the river every day? A) S -He times. ba31 ot smit to tol s beon Iliw I (10 smit to jo! (A Saki) (4) 本文の内容に合うものを次のア~エから1つ選び,記号で答えなさい。 The teacher was teaching about swimming.gin to sed ette vam se s W(S) 1 The girl laughed because the Roman did not finish swimming near his clothes. The teacher told his students a funny story about a Roman. id) solo bluodas Wis un breakfast made the girl strong. C hisq aidT

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